Improvement in carpenters  groovingmplane



tbtited tats THEODORE DUVAL, OF HARTFORD, CONNECTICUT.

ALetters Patent No. 97,17 7, dated .November 23, 1869.

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IMPROVEMENT- IN CARPETERS G-ROOVINCLPLANE.

The Schedule referred to in these Letters Patient and making part of the same.

To all whom it may concern:

-- called a dado, in two parts, so that the two parts may be easily and quickly adjusted relatively to each other, that a groove `o r grooves may be formed therewith ot' various widths.

lhese dadoes,7 as usually made by tool-makers, are kept on sale by tool-venders, classified as moulding-tools, are made ot' various widths, to cut or form grooves of certain widths, each tool for each width.

The object ot' this invention is to produce in one tool all' that is required to t'orm grooves ot' several dit'- ferent widths, or of any particular width, according to the thicknessv ot' a shelf, or other purpose for which said grooves may be required.

In the accompanying drawings- Figure l isa faceview of a fd-ado constructed aft-cr this improvement.

Figure 2 is an end view.

`Figure 3 is a cross-section view, showing how the two parts are expanded or contracted to form a groove of an)1 given or desired width.

,'ihe dadostocks, made in two parts, each of which partsis constructed very much in the common way ot' making fdadoes.

These two partsare held in uniform relative posi-l tions with each other, and expanded oreontracted to the width it is desirable the tool shall cut, by means ot' adjusting-screws f.

d are metallic plates, fitted into depressions formed in the outsides, near the ends, and Hush with the sur- 1 face ofthe stock. These platesare firmly secured by screws to lthe stock.

The plates upon one side of the tool are provided with hubs e, through which the screws f are tted to turn in and ont closely and freely.

The screws j' pass through the plates (l and stock, and are held in a fixed position against an endwise movement by a collar, g, recessed into and tlnshwith the inside surface of the stock, thence the screw passes into thel hubs e.

The screws j" pass-through the plates 'd and stock, into the hubs e.

The cuttingirons, gauge, or stops which regulate the depth 'ot' the groove to he cut by the tool, thel spurs for cutting the width ot' the groove, are all coustructed very niuch in the common way.

Now, it will be seen that with the use of this dado or grooving-tmil, I am enabled to adjust the double or two parts so that the grooves may be made therewith of any desirable width, thus accomplishing with one tool what hereofore has required several tools, or, in other words, has heretofore required a tool for each width ot' groove to be formed.

I believe l have thus shown the nature, construction, and advantage ot' this invention, so as to enable others skilled in the art to make and use the same therefrom.

What l claim, and desire to secure by Letters Patent, is

As an article of manufacture, a `dado or groovingplane for carpenters use, when constructed in two parts, and made'adjustable in the manner substantially as shown and described, and for the purpose' specified.

his y THEODORE "X DUVAL. [1.; s] Y mark.

'Witnesses N. C. WILDER, JEREMY W. BLIss. 

